Small gas patch for reading alternate forms of MIPS coprocessor register names

[Eric Christopher]

> > Should I just
> > check INSN_COP at first, then peek at the insn directly to determine which
> > coprocessor its looking at?
> 
> Oi.  That's kinda gross, but may be the "best" that can be done
> currently.

I'm thinking that this is the best bet, otherwise we'd have something
cleaner for some of the warnings as well (tag this instruction as blah,
make check for flag in instruction)...

-eric

-- 
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a fire.